One of my reasons for pre-washing.
Ok I borrowed some Retayne from a friend. Used it and color catchers. Put it through a double rinse. Not sure if I can say the brand of fabric so I won't but I just got done wiping my washing machine with bleach and wiping out my dryer. I threw in some doggy towels into the washer with a bleach wash and then after wiping my dryer threw the wet towels into the dryer. This was the worst I have ever had with prewashing. The color is a Hunter green. I will not be using this with light colors at all. This will not be used near any light colors. This fabric bled like a stuck hog!!